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Finding the Fourth Proportional to 612,919.20, 919,378.80 and 472,951.20

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Solution

The fourth proportional to 612,919.20, 919,378.80 and 472,951.20 is: 709,426.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,919.20 : 919,378.80 = 472,951.20 : x
  2. Step 2: Convert to fraction form
    612,919.20/919,378.80 = 472,951.20/x
  3. Step 3: Cross multiply
    612,919.20x = 919,378.80 × 472,951.20
  4. Step 4: Simplify right side
    612,919.20x = 434,821,306,714.56
  5. Step 5: Solve for x
    x = 434,821,306,714.56/612,919.20
  6. Step 6: Final answer
    x = 709,426.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.